Harry Potter - Time-Turner

The Time-Turner is a device capable of time travel. The Time-Turner resembled an hourglass on a necklace. The number of times one turns the hourglass corresponds to the number of hours one travels back in time. It is extremely important that the user of a Time-Turner not be seen by past or future versions of themselves.

Hermione Granger received one from Professor McGonagall in 1993 so she could attend more classes in her third year than time would allow. Since McGonagall made her swear to not tell anyone about it, she didn't mention it to Harry or Ron until the end of the school year, when she and Harry used it to travel back in time and save Sirius Black and Buckbeak from certain death. If she did would get into trouble. Special permission from the Ministry of Magic had to be sought to allow Hermione to use one, but her academic record ensured that permission was given.Hermione Granger and Harry Potter use her Time-Turner.Hermione Granger and Harry Potter use her Time-Turner.

"I can't stand another year like this one. That Time-Turner, it was driving me mad. I've handed it in." —Hermione Granger

The confusions of time travel were such that Hermione chose to drop a few subjects at the end of her third year so she could have a normal schedule again. It is also unknown what the effect of living what is essentially another year had on Hermione, whether her use of the Time-Turner for such an extended period of time added an entire year to her physical life.

During the Battle of the Department of Mysteries in 1996, the Ministry's entire supply of Time Turners was smashed. It is unknown when or if the Ministry of Magic will replace them, or if it is even possible to.